Synopsys Timing Constraints And Optimization User Guide 2021 |work| Jun 2026
Reorganizing logic gates to reduce the levels of logic in a critical path.
False paths are paths that are logically impossible, structurally irrelevant, or safely synchronized across asynchronous domains. Disabling them prevents the tool from wasting runtime and area trying to fix them.
Whether you are writing your first create_clock command or debugging a complex multi-cycle path violation, the 2021 edition remains a must-have reference for any digital engineer aiming for successful tapeout. Mastering the guide means mastering the art of telling the tool exactly what your design does, so it can optimize it perfectly for what it must do. synopsys timing constraints and optimization user guide 2021
Are you managing in this design?
In the rapidly evolving world of semiconductor design, achieving timing closure is one of the most significant challenges for engineers. The 2021 suite of Synopsys design tools—specifically Design Compiler (DC), PrimeTime, and IC Compiler II—offered enhanced capabilities to manage complex timing constraints and drive optimizations. Reorganizing logic gates to reduce the levels of
Used for internal clock dividers, multipliers, or gated clocks derived from a master clock. This maintains a phase relationship between the master and derived clock.
Executes the physical implementation (place and route) while continuously analyzing constraints passed from DC. The Role of SDC Whether you are writing your first create_clock command
# Pre-layout: Assume ideal clock behavior with estimated jitter set_clock_uncertainty 0.1 [get_clocks SYS_CLK] # Post-layout: Switch to real clock tree delays set_propagated_clock [get_clocks SYS_CLK] Use code with caution. Creating Base Clocks
A false path is a circuit path that is either topologically impossible to activate or a path where timing violations can be safely ignored (e.g., static configuration registers, asynchronous control signals, or test-mode signals).
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Synopsys Timing Constraints And Optimization User Guide